﻿Overload overload = new Overload();
Console.WriteLine(overload.Add(1, 3));

Console.ReadLine();

public class Overload
{
    public int Add(int a, int b)
    {
        return a + b;
    }

    public int Add(int a, int b, int c)
    {
        return a + b + c;
    }

    public double Add(int a, double b)
    {
        return a + b;
    }
}